Classical Physics

Your sink or toilet bowl do not rotate as a result of the Coriolis force. It's waaaaay to weak to cause the rotation (the earth only rotates 2*pi per day, after all). It's trivial to make the water flow in the opposite direction. (demonstrated by accident when a shyster was filmed doing this and got the rotation direction wrong)

I need to make a mousetrap car for one of my classes and I want to make it fly. I'm thinking on having a foam body and two propellers (to keep it level while in flight). Any suggestions or ideas?

Alright, I can't remember where I read this, but it posed an interesting question. Assume we are communicating with another "earth" that is a light year away. Using communication with light, it would take a year for information to arrive to our planet from theirs. Now, say I have a keyboard attached to a metal pole that stretches from our planet to theirs. Now, when I make a keystroke, the poll is pushed outwards. Would they, on the receiving end, 1 light year away, instantly see the poll being pushed and pulled?

I hear the extreme gravity of black holes bend light ? Light is massless and F=GMm/3^2 , If m is 0 then the force of attraction is zero right ? so light should not be affected by gravity , I also heard people say that the force of gravity is not dependent on mass but is dependent on momentum and energy , but p = mv , and if m is zero p is zero . Can I haz an explanation ? is there some equation that says gravity is influenced by energy rather than mass ?

Query: if two objects containing equal quantities of matter and antimatter were made to collide, would it be necessary to add the kinetic energy produced by the impact velocity to the energy release resulting from these two pieces of matter/antimatter coming together in the first place? If so, I'm left wondering how one can add still further to a full 100% of rest energy into radiant energy. Confused!

When finding the moment of inertia, I was taught that the procedure is to use a constant P for uniform density to equal a derivative of mass over a derivative of volume, dm/dV. And we know that P also equals all of the mass over all of the volume. This seems to mean that the ratio dm/dV equals the ratio m/V. But dV for a cylinder equals 2(pi)*r*h*dr which does not quite equal the volume (pi)(r^2)*h. Or do ratios of infinitesimals to real values work differently than real ratios to real ratios? If so, how?

In classical mechanics, this topic presents a scalar equation of motion, which can be applied in any reference frame (rotating or non-rotating) (inertial or non-inertial) without the necessity of introducing fictitious forces. If we consider two particles A and B of mass [latex]m_a[/latex] and [latex]m_b[/latex] respectively, then the scalar equation of motion, is given by: [latex]\frac{1}{2}\,m_am_b\left[(\mathbf{v}_a-\mathbf{v}_b)^{2}+(\mathbf{a}_a-\mathbf{a}_b)\cdot(\mathbf{r}_a-\mathbf{r}_b)\right]=\frac{1}{2}\,m_am_b\left[2\int\left(\frac{\mathbf{F}_a}{m_a}-\frac{\mathbf{F}_b}{m_b}\right){\cdot}\;d(\mathbf{r}_a-\mathbf{r}_b)+\left(\frac{\mathbf{F}_a}{m_a}-\frac{\ma…

According to the second law of thermodynamics, it is impossible for: heat energy to flow from a colder body to a hotter body an ideal heat engine to have the efficiency of 99% an ideal heat engine to have non-zero power. a physical process to yield more energy than what is put in ^As taken from a homework problem, the explanation: The ideal engine follows a reversible cycle--therefore, an infinitely slow one. If the work is being done at the infinitely slow rate, the power of such an engine is zero. An alternative way to state the second law of thermodynamics is as follows: It is impossible to construct a cyclical heat engine whose sole effect is the continuous tra…

In the example below it's the length of the rod (4m) that is taken as the lever arm to calculate the torques around the top where the shark and tension rope is attached. Can I ask why? Because in a ladder against the wall [torque] problem the length of the ladder isn't taken as the lever arm it's the perpendicular distance from the pivot point (usually where the leader meets the ground) to a point on the ladder. Thanks.

Do we need the imaginary axis to describe the location of a virtual image produced by a plane mirror? Please advise.

When the first planets formed they all aggregated into similar shapes (approx spherical masses).? Why? Even though speed of rotation differs greatly the net result was, and is always, approximately spherical. Also the earth is not a perfect sphere but an oblate spheroid. Why? Please advise. Thanks in advance.

In areas of very strong gravitational fields like black holes does space curvature also warp time? As we know time as we know it ceases to exist at this point? If time was a scalar then distortion of time would not be possible and it would be absolute.? What is the conclusion to be drawn from this?

Hello all, the problem: A rod of length L, cross sectional area A, Young's modulus E and density rho moves with velocity v, hitting with its end on a rigid plane. Questions: 1. What is the maximum impact stress sigma? 2. How propagates the elastic stress wave in the rod (time and coordinate dependence)? An answer to question 1 could be sketched in this way: The impact stress is sigma = rho c v, where the wave velocity c is the square root of E/rho. This follows from the impuls change of the rod dp in a time interval dt, (i) dp = sigma A dt, substituting (ii) dp = rho A v c dt. Some explanations: Equation (i) invokes the stress sigma at the impacting cross…

Is there some way to force common batteries to use up all of their stored energy at once?

Hi guys, I was wondering about something I read in Wikipedia (See Here) that states that if you apply certain magnetic fields to plasma, you can take advantage of the fact that it is ionised and manipulate it into a sort of filament. Thanks in advance - if you answered my question - otherwise, meh (Meaning a short dismissive grunt).

Hey, I am pretty new to the forums but I think I have a pretty valid question. I have a physics teacher and in class we are talking about simple machines. He believes that there is another simple machine besides just the main two: Lever, and Inclined Plane. There are others like pulley, wheel and axle, etc. But he thinks that there is another one that is listed with the main six. I have done some looking and the only other thing I have some up with is possibly a gear, but I think that can be classified as a wheel or better yet a lever. I would like some of your guys thoughts, I have until Friday to figure it out and help would be greatly appreciated!!!!!!

Hi. Will a plastic linear fresnel lens focus a spot instead of a line if flexed across its line axis ? Just as reference: ---->

This isn't homework. I'm reviewing physics after many years of neglect. As with most of my posts, I made this problem up. Let object A have mass [latex]m_A[/latex] and object B have mass [latex]m_B[/latex]. One of A's surfaces is flat, as is one of B's. These flat surfaces are in contact and slide relative to each other in a straight line for a distance, x, experiencing kinetic friction. The kinetic friction, of magnitude f, is constant and is the only force acting on A or B in the direction of motion, and the only other forces acting on A and B are the normal forces pressing the surfaces together. The normal forces are assumed to be equal and opposite, so that the o…

I have always heard that the energy stored in a capacitor is within the dielectric, and not stored on the plates. What about an air gap capacitor? Is the air between the plates storing charge? Seems that normal convection currents within the area of an old school tuning cap would make the oscillator unsteady and stations would drift, so it seems it doesn't hold true. What if the plates were in a vacuum? Then where would the charge stay? Seems there is some charge storage capability in the plates, but a minor amount, Large values can only be stored in a dielectric material, or so it would seem.....edd

After looking for this answer online I was surprised I couldn't find it.. so naturally I came here Anyways, I was taught in class that friction = coefficient*normal force. My question is what happens if we have an angled normal force (with respect to our axes), would the normal force in the friction equation be one of the components, or the magnitude of the entire normal force?

Hy. I am stuck at the displacement current. Here is a picture. Thanks !

ok so say for instance you are being sucked into a black hole and matter and has an asymptote value of how close it can get to the speed of light and the change in relative time to the outside world assuming we can observe the inside of a black hole would matter literally slow down after it crosses the event horizon because the relative time is effected so much?

Why are raindrops shaped the way they are?

When a helium atom is in a field between cathode and anode at a about 30 volt Question will the helium atom aquire a nefative charge ? and then release the quired electron at the anode ?

I've been trying to compute for the Work done by the wind F using calculus. Haven't had progress at all. http://www.pennsbury.k12.pa.us/pennsbury/Staff%20Pages/Pennsbury%20High%20West/Paulson,%20Tim/Honors%20Physics%20Fall%202013/Resources%20and%20Links/Materials%20by%20Chapter/Chapter%206/Jane%20and%20Tarzan%20solution.pdf